Feem ntau, qhov no yog qhov tseeb. Txawm li cas los xij, nrog kev txhim kho ntawm computer thiab digital circuit technology, lub peev xwm cuam tshuam ntawm tib neeg-tshuab interface cov khoom tau dhau los ua kom muaj zog thiab muaj zog. Ntxiv rau cov kev sib txuas lus ib txwm muaj (RS232, RS422 / RS485) kev sib txuas lus, qee cov khoom siv tib neeg-tshuab interface twb muaj cov ntaub ntawv cuam tshuam xws li chaw nres nkoj network, chaw nres nkoj sib txuas, USB chaw nres nkoj, thiab lwm yam. raws li qhov chaw nres nkoj network, qhov chaw sib txuas, chaw nres nkoj USB, thiab lwm yam kom paub txog tib neeg-tshuab sib cuam tshuam ntawm cov khoom siv.
